<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>ERRPIDR3</title>
    <link href="insn.css" rel="stylesheet" type="text/css"/>
  </head>
  <body><table style="margin: 0 auto;"><tr><td><div class="topbar"><a href="AArch32-regindex.html">AArch32 Registers</a></div></td><td><div class="topbar"><a href="AArch64-regindex.html">AArch64 Registers</a></div></td><td><div class="topbar"><a href="AArch32-sysindex.html">AArch32 Instructions</a></div></td><td><div class="topbar"><a href="AArch64-sysindex.html">AArch64 Instructions</a></div></td><td><div class="topbar"><a href="enc_index.html">Index by Encoding</a></div></td><td><div class="topbar"><a href="ext_alpha_index.html">External Registers</a></div></td><td><div class="topbar"><a href="ext_enc_index.html">External Registers by Offset</a></div></td><td><div class="topbar"><a href="func_index.html">Registers by Functional Group</a></div></td><td><div class="topbar"><a href="notice.html">Proprietary Notice</a></div></td></tr></table><hr/><h1 class="register-section">ERRPIDR3, Peripheral Identification Register 3</h1><p>The ERRPIDR3 characteristics are:</p><h2>Purpose</h2>
        <p>Provides discovery information about the component.</p>

      
        <p>For more information, see <span class="xref">'About the Peripheral identification scheme'</span>.</p>
      <h2>Configuration</h2><p>Implementation of this register is <span class="arm-defined-word">OPTIONAL</span>.</p>
        <p>ERRPIDR3 is implemented only as part of a memory-mapped group of error records.</p>
      <h2>Attributes</h2>
        <p>ERRPIDR3 is a 32-bit register.</p>
      <h2>Field descriptions</h2><h3>When the component uses a 12-bit part number:</h3><table class="regdiagram"><thead><tr><td>31</td><td>30</td><td>29</td><td>28</td><td>27</td><td>26</td><td>25</td><td>24</td><td>23</td><td>22</td><td>21</td><td>20</td><td>19</td><td>18</td><td>17</td><td>16</td><td>15</td><td>14</td><td>13</td><td>12</td><td>11</td><td>10</td><td>9</td><td>8</td><td>7</td><td>6</td><td>5</td><td>4</td><td>3</td><td>2</td><td>1</td><td>0</td></tr></thead><tbody><tr class="firstrow"><td class="lr" colspan="24"><a href="#fieldset_0-31_8">RES0</a></td><td class="lr" colspan="4"><a href="#fieldset_0-7_4">REVAND</a></td><td class="lr" colspan="4"><a href="#fieldset_0-3_0">CMOD</a></td></tr></tbody></table><h4 id="fieldset_0-31_8">Bits [31:8]</h4><div class="field">
      <p>Reserved, <span class="arm-defined-word">RES0</span>.</p>
    </div><h4 id="fieldset_0-7_4">REVAND, bits [7:4]</h4><div class="field">
      <p>Component minor revision. <a href="ext-errpidr2.html">ERRPIDR2</a>.REVISION and ERRPIDR3.REVAND together form the revision number of the component, with <a href="ext-errpidr2.html">ERRPIDR2</a>.REVISION being the most significant part and ERRPIDR3.REVAND the least significant part. When a component is changed, <a href="ext-errpidr2.html">ERRPIDR2</a>.REVISION or ERRPIDR3.REVAND are increased to ensure that software can differentiate the different revisions of the component. ERRPIDR3.REVAND should be set to <span class="binarynumber">0b0000</span> when <a href="ext-errpidr2.html">ERRPIDR2</a>.REVISION is increased.</p>
    
      <p>This field has an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> value.</p>
    <p>Access to this field is <span class="access_level">RO</span>.</p></div><h4 id="fieldset_0-3_0">CMOD, bits [3:0]</h4><div class="field"><p>Customer Modified.</p>
<p>Indicates the component has been modified.</p>
<p>A value of <span class="binarynumber">0b0000</span> means the component is not modified from the original design.</p>
<p>Any other value means the component has been modified in an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> way.</p><p>For any two components with the same Unique Component Identifier:</p>
<ul>
<li>If ERRPIDR3.CMOD is zero in both components, then the components are identical.
</li><li>If ERRPIDR3.CMOD has the same nonzero value in both components, then this does not necessarily mean that they have the same modifications.
</li><li>If ERRPIDR3.CMOD is nonzero in either component, the two components might not be identical despite having the same Unique Component Identifier.
</li></ul>
<p>This field has an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> value.</p><p>Access to this field is <span class="access_level">RO</span>.</p></div><h3>When the component uses a 16-bit part number:</h3><table class="regdiagram"><thead><tr><td>31</td><td>30</td><td>29</td><td>28</td><td>27</td><td>26</td><td>25</td><td>24</td><td>23</td><td>22</td><td>21</td><td>20</td><td>19</td><td>18</td><td>17</td><td>16</td><td>15</td><td>14</td><td>13</td><td>12</td><td>11</td><td>10</td><td>9</td><td>8</td><td>7</td><td>6</td><td>5</td><td>4</td><td>3</td><td>2</td><td>1</td><td>0</td></tr></thead><tbody><tr class="firstrow"><td class="lr" colspan="24"><a href="#fieldset_1-31_8">RES0</a></td><td class="lr" colspan="4"><a href="#fieldset_1-7_4">REVISION</a></td><td class="lr" colspan="4"><a href="#fieldset_1-3_0">CMOD</a></td></tr></tbody></table><h4 id="fieldset_1-31_8">Bits [31:8]</h4><div class="field">
      <p>Reserved, <span class="arm-defined-word">RES0</span>.</p>
    </div><h4 id="fieldset_1-7_4">REVISION, bits [7:4]</h4><div class="field">
      <p>Component revision. When a component is changed, ERRPIDR3.REVISION is increased to ensure that software can differentiate the different revisions of the component.</p>
    
      <p>This field has an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> value.</p>
    <p>Access to this field is <span class="access_level">RO</span>.</p></div><h4 id="fieldset_1-3_0">CMOD, bits [3:0]</h4><div class="field"><p>Customer Modified.</p>
<p>Indicates the component has been modified.</p>
<p>A value of <span class="binarynumber">0b0000</span> means the component is not modified from the original design.</p>
<p>Any other value means the component has been modified in an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> way.</p><p>For any two components with the same Unique Component Identifier:</p>
<ul>
<li>If ERRPIDR3.CMOD is zero in both components, then the components are identical.
</li><li>If ERRPIDR3.CMOD has the same nonzero value in both components, then this does not necessarily mean that they have the same modifications.
</li><li>If ERRPIDR3.CMOD is nonzero in either component, the two components might not be identical despite having the same Unique Component Identifier.
</li></ul>
<p>This field has an <span class="arm-defined-word">IMPLEMENTATION DEFINED</span> value.</p><p>Access to this field is <span class="access_level">RO</span>.</p></div><h2>Accessing ERRPIDR3</h2><h4>ERRPIDR3 can be accessed through the memory-mapped interfaces:</h4><table class="info"><tr><th>Component</th><th>Offset</th><th>Instance</th></tr><tr><td>RAS</td><td><span class="hexnumber">0xFEC</span></td><td>ERRPIDR3</td></tr></table><p>Accesses on this interface are <span class="access_level">RO</span>.</p><hr class="bottom_line"/><table style="margin: 0 auto;"><tr><td><div class="topbar"><a href="AArch32-regindex.html">AArch32 Registers</a></div></td><td><div class="topbar"><a href="AArch64-regindex.html">AArch64 Registers</a></div></td><td><div class="topbar"><a href="AArch32-sysindex.html">AArch32 Instructions</a></div></td><td><div class="topbar"><a href="AArch64-sysindex.html">AArch64 Instructions</a></div></td><td><div class="topbar"><a href="enc_index.html">Index by Encoding</a></div></td><td><div class="topbar"><a href="ext_alpha_index.html">External Registers</a></div></td><td><div class="topbar"><a href="ext_enc_index.html">External Registers by Offset</a></div></td><td><div class="topbar"><a href="func_index.html">Registers by Functional Group</a></div></td><td><div class="topbar"><a href="notice.html">Proprietary Notice</a></div></td></tr></table><p class="versions">30/03/2023 19:07; 997dd0cf3258cacf72aa7cf7a885f19a4758c3af</p><p class="copyconf">Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.</p></body>
</html>
